Pathfinder - How to Play 5 - Equipment

Adventurers make use of a wide variety of items, including weapons, armor, tools,
and various trinkets.

Currency

Currency in Pathfinder is very easy. Coins come in four denominations: copper
pieces (cp), silver pieces (sp), gold pieces (gp), and platinum pieces (pp). Each
denomination is worth 10 of the previous denomination (10 cp = 1 sp, 10 sp = 1 gp,
10 gp = 1 pp). Items are typically list their price in gp, though cheaper items
may be listed in cp or sp. 50 coins of any denomination weight one pound, and coins
are roughly the size of an American quarter.

Art items and gems have a set gp value, and can be traded for that value in coins.
If you GM cares to do so, you may need to use the Appraise skill to make sure that
you are getting the right price for these items. Because gems are considerably more
valuable for their weight than coins, it can be convenient to carry gems around
instead of huge sacks of coins.